研究目的
Investigating the channels of information leakage in fiber-optic communication lines and analyzing methods for their detection to enhance information security.
研究成果
Unauthorized connections can be made through macrobends in optic communication lines, necessitating detection systems based on optical reflectometers. The findings support developing techniques and algorithms for detection, with methods like OFDR offering higher resolution and sensitivity.
研究不足
The pulse-sounding method has limitations in spatial resolution for long single-mode optic lines (beyond 20 km), and some parameters (e.g., light flux type, cylindrical shape effects) were not fully accounted for in estimations.
1：Experimental Design and Method Selection:
The study involves theoretical analysis and modeling of information leakage channels in fiber-optic lines, focusing on mechanical and acoustic actions that disturb total internal reflection. Methods include impulse reflectometry (OTDR) and frequency reflectometry (OFDR) for detection.
2：Sample Selection and Data Sources:
Not explicitly specified; based on general principles of fiber optics and references to prior research.
3：List of Experimental Equipment and Materials:
Not detailed; implied use of optical fibers with specific parameters (e.g., core diameter 50μ, sheath diameter 125μ, refractive indices n1=1.481, n2=1.476).
4：481, n2=476).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Describes theoretical calculations for bending radius and intensity of radiation using Fresnel formulas, and reflectometry techniques for detecting unauthorized connections.
5：Data Analysis Methods:
Utilizes mathematical expressions (e.g., Eq. 1-5) to estimate parameters like bending radius and connection coordinates, with analysis of reflectograms.
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